title: Modified Portable A-Scan Ultrasound Instrument from a USB B-Scan Device.
abstract: BACKGROUND
  Affordable, portable A-scan ultrasound technology is important to the pediatric or mission cataract surgeon. Some units (i.e.; Biopen) are no longer marketed and report poorly on atypically shaped eyes.
  
  
  METHODS
  A clear plastic tube-housing was shaped to accept a USB-portable B-scan for supine immersion ultrasonography.
  
  
  RESULTS
  With IRB approval and consent, 34 eye surgery subjects, aged 0.3 to 70 years, had both conventional contact A-scan compared with modified B-scan immersion measurements. The correlation between them was: A-Scan = 0.995 (B-Scan) +0.197. r2 = 0.995.
  
  
  CONCLUSIONS
  The immersion B-Scan closely matched conventional A-Scan over a range of axial lengths from 18 to 26 mm.
  
  
  CONCLUSIONS
  Affordable combined B-Scan and A-Scan technology can be useful for the pediatric and mission cataract surgeon.
authors.forename: Robert W
authors.initials: RW
authors.lastname: Arnold
mesh_terms: D002386:Cataract / Q000000981:diagnostic imaging; D002387:Cataract Extraction; D005123:Eye / Q000000981:diagnostic imaging; D006801:Humans; D007101:Immersion; D007910:Lenses, Intraocular; D059906:Neuroimaging; D014463:Ultrasonography